I repaired the speakers in my RX. It was quite easy and made a huge difference so I thought I'd describe it here.
I have the 2006 with Mark Levinson and Navigation. When we bought the car a year ago (used with 90k miles) the stereo sounded great except that the 6x9's in the front doors made a buzzing noise with bass sounds. I assumed the speakers were blown and put new speakers on my list of things to do... When I looked into it further I learned that this is a common failure of most toyota/lexus vehicles of this era, but the speakers are not blown. The foam surround on the speakers
